Localized Cooling in Flux Crystal Growth

Abstract

%) . . UC + 0 . 1 w t % Ni 0.127 5 MOz-,t 0.083 8 90 W t % M(Oo.34C0.66) + 10 W t % MOz uoz 0.064 2 0.036 2 -* Uncorrected for porosity. t M = (Uo.sPua.i). relations plotted by McAdams" for a semi-infinite solid. I n UC and UOz, thermal conductivities were calculated using reported heat capacity values16 of 0.048 cal/g-OC and 0.060respectively. An assumed value of 0.048 cal/g-OC was used for the monoxide-type materials because of the similarity of their molecular structures with that of carbide.The calculated values presented in Table V show that the monoxide-type compositions have higher room-temperature conductivities than those of (U,PU)OZ and UO,. Although the absolute values for UC and UO, are lower than expected, the relative values are reasonably good. These data, therefore, are believed to be useful for qualitative comparison.

Hydrothermal growth of AIIBVI semiconductors

“…For ZnO the slow cooling of zinc oxide solution in lead fluoride melt (Kashyap 1973;Nielson and Dearborn 1960) from 1150 down to 800°C enabled to obtain large, but very thin ZnO plates. The same results were obtained by the other workers (Wolff and Labelle 1965;Chase and Osmer 1967;Timofeeva 1965;Wanklyn 1970). Besides the "inconvenient" habit, the flux grown ZnO crystals are nonstoichiometric, extremely heterogeneous and contain high concentration of impurities and melt inclusions.…”

Zinc Gallium Oxide—A Review from Synthesis to Applications

“…Most flux methods synthesize small crystals, such as those of Chase and Osmer [56], who obtained ZnGa 2 O 4 crystals in the size range of 3-6 mm using PbO-PbF 2 -B 2 O 3 flux. Vanderstraten et al [57] synthesized large ZnGa 2 O 4 crystals-up to 10 mm along the edge-using the same flux with the addition of SiO 2 at the cooling rate of 0.5 • C/h.…”

Growth and morphology of ruby crystals with unusual chromium concentration

“…The complex flux VII contained 71.6 and 28.2 mol% of PbF 2 and Bi 2 O 3 , respectively. Last flux composition has been used by authors [5] for the growing of the isometric rhombohedr-like single crystals. Unfortunately, the lack of the Al 2 O 3 solubility data for this flux composition holds back of the progress in to checked growing of large ruby single crystals.…”